react-agent-python template does not work

[viren-vii]

Checked other resources

• This is a bug, not a usage question. For questions, please use GitHub Discussions.
• I added a clear and detailed title that summarizes the issue.
• I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
• I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue.

Example Code

langgraph new path/to/your/app --template react-agent-python

Error Message and Stack Trace (if applicable)

File "C:\Python311\Lib\site-packages\starlette\routing.py", line 693, in lifespan
    async with self.lifespan_context(app) as maybe_state:
  File "C:\Python311\Lib\contextlib.py", line 204, in __aenter__
    return await anext(self.gen)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\langgraph_api\lifespan.py", line 30, in lifespan
    await collect_graphs_from_env(True)
  File "C:\Python311\Lib\site-packages\langgraph_api\graph.py", line 257, in collect_graphs_from_env
    graph = await run_in_executor(None, _graph_from_spec, spec)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\langchain_core\runnables\config.py", line 588, in run_in_executor
    return await asyncio.get_running_loop().run_in_executor(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\concurrent\futures\thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\langchain_core\runnables\config.py", line 579, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\langgraph_api\graph.py", line 295, in _graph_from_spec
    modspec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "D:\projects\forexdropoff\react-agent\./src/react_agent/graph.py", line 14, in <module>
    from react_agent.configuration import Configuration
ModuleNotFoundError: No module named 'react_agent'
Could not import python module for graph:
GraphSpec(id='agent', path='./src/react_agent/graph.py', module=None, variable='graph', config=None)
This error likely means you haven't installed your project and its dependencies yet. Before running the server, install your project:

If you are using requirements.txt:
python -m pip install -r requirements.txt

If you are using pyproject.toml or setuptools:
python -m pip install -e .

Make sure to run this command from your project's root directory (where your setup.py or pyproject.toml is located)
 [uvicorn.error] api_variant=local_dev
2025-01-19T02:33:06.962480Z [error    ] Application startup failed. Exiting. [uvicorn.error] api_variant=local_dev

Description

I am trying to run the template on the local server.
Despite following the docs the same error is triggering. I have tried to fix the packages but have not been able to go around.

System Info

System Information

OS: Windows
OS Version: 10.0.22631
Python Version: 3.11.4 (tags/v3.11.4:d2340ef, Jun 7 2023, 05:45:37) [MSC v.1934 64 bit (AMD64)]

Package Information

langchain_core: 0.3.30
langchain: 0.3.14
langchain_community: 0.3.14
langsmith: 0.2.11
langchain_anthropic: 0.3.3
langchain_fireworks: 0.2.6
langchain_openai: 0.3.0
langchain_text_splitters: 0.3.5
langgraph_sdk: 0.1.51

Optional packages not installed

langserve

Other Dependencies

aiohttp: 3.11.11
anthropic: 0.43.1
async-timeout: Installed. No version info available.
dataclasses-json: 0.6.7
defusedxml: 0.7.1
fireworks-ai: 0.15.11
httpx: 0.28.1
httpx-sse: 0.4.0
jsonpatch: 1.33
langsmith-pyo3: Installed. No version info available.
numpy: 1.26.4
openai: 1.59.8
orjson: 3.10.15
packaging: 24.2
pydantic: 2.10.5
pydantic-settings: 2.7.1
PyYAML: 6.0.2
requests: 2.32.3
requests-toolbelt: 1.0.0
SQLAlchemy: 2.0.37
tenacity: 9.0.0
tiktoken: 0.8.0
typing-extensions: 4.12.2
zstandard: Installed. No version info available.

[vbarda]

The traceback you provided shows a recommended solution:

If you are using pyproject.toml or setuptools:
python -m pip install -e .

It means you haven't installed the project dependencies. Let me know if running this command and then running langgraph dev again fixes this for you

[vbarda]

Closing due to inactivity - the issue should be resolvable by installing the dependencies as in the snippet above